NXP Semiconductors BUK9608-55,118

Overview

BUK9608-55,118 from NXP Semiconductors (formerly Philips) is an N-channel enhancement-mode logic-level TrenchMOS power transistor in SOT404 (TO-263) package, rated for 55 V drain-source voltage, 75 A DC drain current at 25 °C, 8 mΩ R_DS(ON) at V_GS = 5 V, and 187 W total power dissipation. It integrates ESD protection up to 2 kV and is designed for high-current automotive switching applications such as body control modules and motor drivers.

For engineers reviewing the BUK9608-55,118 datasheet, BUK9608-55,118 pinout, BUK9608-55,118 application, or BUK9608-55,118 equivalent, key selection criteria include its logic-level gate drive compatibility (V_GS(th) = 1.0–2.0 V), low on-resistance at 5 V gate bias, integral reverse diode with 75 A continuous rating, and thermal resistance of 0.8 K/W junction-to-mounting-base.

Technical Context

The BUK9608-55,118 employs trench-gate MOSFET architecture to achieve low R_DS(ON) and high current capability while maintaining logic-level gate drive compatibility. Its gate threshold voltage range (1.0–2.0 V at 25 °C) ensures reliable turn-on with standard 5 V microcontroller outputs, and its integral body diode supports freewheeling in inductive loads without external components.

Thermal performance is optimized via direct die-to-mounting-base conduction path (R_{th j-mb} = 0.8 K/W max), enabling high-power operation when mounted on a heatsink. The device meets IEC 134 absolute maximum ratings, including 175 °C junction temperature and 240 A pulsed drain current, supporting robust operation in automotive under-hood environments.

Key Specifications

Pinout & Package

Package: SOT404 (TO-263), surface-mount, with exposed mounting base (pin 2 and mb) thermally and electrically connected to drain. Dimensions: 15.4 mm × 10.3 mm × 4.5 mm; net mass 1.4 g; UL94 V0 epoxy.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar N-channel logic-level power MOSFET applications.

Compared with STL220N5LF5 and IRF1405PBF, the BUK9608-55,118 uniquely guarantees full enhancement at 5 V gate bias with tight V_GS(th) distribution (1.0–2.0 V), making it the most robust choice for direct MCU-switched automotive loads where gate drive voltage headroom is constrained.

Availability

BUK9608-55,118 is available at Aetrix Electronics and suitable for automotive body electronics, industrial motor control, off-road equipment power management, and HVAC blower systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for BUK9608-55,118 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

NXP Semiconductors is a global semiconductor company formed from the spin-off of Philips' semiconductor division, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.

The BUK9608-55,118 belongs to NXP's TrenchMOS logic-level power MOSFET product line, engineered specifically for automotive-grade switching applications demanding high current, low gate drive voltage, and ruggedized thermal and ESD performance.

FAQ

What is the maximum continuous drain current for BUK9608-55,118 at 100 °C mounting base temperature?

The BUK9608-55,118 supports 65 A DC drain current at T_mb = 100 °C, as specified in the Limiting Values table. This derated value reflects thermal constraints of the SOT404 package and must be used in thermal design calculations when ambient or heatsink conditions limit mounting base temperature to 100 °C. The full 75 A rating applies only at T_mb = 25 °C.

Does BUK9608-55,118 have an integrated body diode, and what are its key ratings?

Yes, the BUK9608-55,118 includes an integral reverse diode rated for 75 A continuous reverse drain current (I_DR) and 240 A pulsed reverse drain current (I_DRM). Its forward voltage is 0.85–1.2 V at 25 A and 1.0 V typical at 75 A, with reverse recovery time of 65 ns and charge of 0.18 µC - enabling efficient freewheeling in inductive switching applications without external diodes.

Is BUK9608-55,118 suitable for high-frequency PWM motor control above 20 kHz?

Yes, the BUK9608-55,118 supports high-frequency PWM operation: its typical turn-on delay is 45 ns, rise time 120 ns, turn-off delay 225 ns, and fall time 100 ns (at V_DD = 30 V, I_D = 25 A, R_G = 10 Ω). These values enable clean switching at 20–50 kHz, though gate drive strength and PCB layout must minimize parasitic inductance (L_d = 3.5 nH, L_s = 7.5 nH) to preserve timing integrity.

What is the thermal resistance from junction to mounting base for BUK9608-55,118, and how should it be applied in heatsink design?

The BUK9608-55,118 has a maximum thermal resistance of 0.8 K/W from junction to mounting base (R_{th j-mb}). In heatsink design, this value represents the dominant thermal path - the mounting base must be soldered to a large, low-thermal-resistance copper area or directly attached to an external heatsink. Total system thermal resistance (junction-to-ambient) is the sum of R_{th j-mb} + R_{th mb-heatsink} + R_{th heatsink-ambient}.

Can BUK9608-55,118 withstand automotive load dump transients without external clamping?

No - while the BUK9608-55,118 has a 55 V V_DS rating and 500 mJ unclamped avalanche energy, it is not rated for repetitive 120 V load dump transients per ISO 7637-2. External transient voltage suppressors (TVS) are required for compliance. The device's 55 V rating targets normal 12 V/24 V system operation plus moderate overvoltage margins, not full load dump protection.